Writing-machine.



. IUNITED ATES.

,EDWARD n. rinse, or New YORK.

PATIE NT c -es.

NQY.) ASSIGNOR To ROYAL 'iYP-E- WRI'IITERLUOMPANY, on 'HOBOKFW N w JERsEY, -A coaromrion or EW JERSEY.

Specification of Letters'Patent.

I-WRITINIG--MACI-IIIINE. II

Patented Aug. 7, 1906.

a tlicatien-filed August 31.1905. I Serial-No. 276,486.

To aZZv/ultom it may concern: Be it knownthat I, EDWARD'B. Hess, ,a citizen of the. United States, residingv in the vborough of Brooklyn, city of New York,

vices of a type-writing machine. is toimprove the, feed of the carriage with respect to speed, toreduce the load imposed] upon the finger-pieces in actuating the es State of- New York, have invented certain new and useful Improvements in'Writing- Machines of which the following is a speciin cation. I I I I Thisinvention relates to escapement decapement, and reduce-wear of the parts.

Itconsists, broadly stated, in employing as one of the escapementesilrfaces in contact, during the releaseoperation of the devices a roller against the periphery of which t 'e other surface bears.

On'e form, 1n which experience has demonstrated the practicability and high efli ciency of this invention, is that; illustrated in the accompanying drawings," which show the invention applied 'to' arooking escapement frame orlever of an ordinary type','having the usual loose, dog and rigid part'or dog cooperating with an escape-wheel. The invention is, however, equally applicable to other arrangements." I

Figure 1 is a side elevation showing a keylever and associated means for operating the escapement-lever; Fig. 2, a front elevation of the escapement devices;.and'Fig. 3, an

enlarged side elevation, partly broken away,

of the escapement devices. 1

aisthe carriage-rack, and b the escapewheel connected with the rack by the usual pinion; 3c is' a' pivotally-mounted escapement lever'orframe, carrying an ordinary loose or pivoted spring-actuated dog (1 and having a rigid partor dog 0. .Mounted-in the end of the rigid dog. is a roller f, which affords the surface of the rigid do a ainst which the teeth of the esca e-' hee ..a rut to-hold-the carriage. g is-a. ey-lever, h the universal bar, and 'i a. link that operatively connects the universal bar with one arm of a bellcrank lever Whose otherarm is connected,

. with the escapement-leverby a'link t The generalbehavior ofthese parts, with the exception of the roller f, is ordinary-and well understood. The axis of the roller is at to the wheel." Its object rightangles, or substantially so, to the axis of the escape-wheel and parallel, or sub-' stantially so, with the plane of the escapewheel,- andis so placed. that a' line'passing I through it lies in. the plane occupied by the teeth of'the-wh'eel' when engaged bythe roller. In the special construction shown the axis of the roller is approximately radial V-V-hen-the escapement mechanism is 'ac qtuated on depression of a key-lever, the.

loose dog-pas'ses out ofengagem'ent with the escape-wheel tooth that it has been holding 1 and the roller of the otherdog passes into en'- gagement with the same tooth. Ordinarily therigid dog o'fan escapement-lever has its operating-faeeset a smallfraction of'an inchbehind the operating-face of the loose springdog, or,'in'other words, a slight drop or lead is given to the rigid dog; Of coursethe roller herein-shown may in that respect conform to whatever is the desired practice. A tooth of the escape-wheel when. held by the roller may and doesbear upon-its highest point, considered with reference tof the tooth, and the strain of the tooth upon it is a radial one. As illustrated, feed of the carriage occurs as the finger piece or key rises. The invention is equally applicable where the escapement ;mechanism.is arranged; to efiect the feed during depression of the finger-piece. In such case theloadon the finger-pieceis reduced. As theroller commences to pass away from the tooth .with which it'is in engagement it is turnedby the pressure of the tooth in thedirection in which the tooth is carried bythestrain of the carriage-s ring. The roller holds the tooth firmly, ut commences to ing surfaces,- particularly that of the roller,

and no cutting or scoring thereof by the edge of' the teeth, such as occurs with'the well-' known bevel-dog-. Moreover, no lubrication of the surfaces is necessary with this escapement and. exper ence has also shown that T lubrication of the bearing of the roller is not required. r I claim as my invention g 1. Wheel escapement mechanism fora writing-machine, comprising a dog whose working surface is a roller upon the periphery of whichthe teeth of the wheel engage. 1

or a

2. Wheel escapement mechanism writing-machine, comprising a dog having a roller turning about an axisradial, of substantially so, to the escape-wheel, and upon the periphery of which the workingsurfaces of the teeth of the wheel bear.

3. An escapement mechanism for a type writing-machine, comprising a part to be controlled and a dog having a roller adapted to i the roller.

engage said part and to be revolved during its movement out of engagement therewith "and in the direction that said part moves.

4. Anescapement mechanism for a typewriting machine, comprising an escape-. wheel, a movable frame, a 'loosedog and a dog with a roller carried by the frame, the

axis about which the roller turns being trans verseto the axis of the wheel and the teeth of the latter working against the periphery of the periphery of which the teeth of the w eel I I of the bear and which is adapted to be moved with the wheel turns.

6. An escapement mechanism for a type writing machine, comprising an escapewheel and a dog, having a roller whose axis is parallel, or substantially so, with the plane in which the-escape-wheel turns and upon the periphery of' which the teeth of the wheelear. I v v 7. An escapement mechanism for a typewriting machine, comprising a frame rockiu about a horizontal axis, an escape whee turnin about. an axis at right angles to that frame anda dog having a roller, form ing its working surface, turning about an axis at right angles, or substantially so, to the othertwo axes, and upon. the periphery'of which thewvorking surfaces of the teeth of 55 the escape-wheel bear. v

8. An escapement mechanism for writingmachines comprising a driven movable part and a detent part, one of which has a'roller upon the periphery of which the workingsurface of the other bears. v

In testimony whereof I- have hereunto subscribed my name.

EDWARD BL Witnesses:

EDWARD C. DAVIDSON, L. F. BROWNING., 

